Study of polymorphism in MDR1 gene exons 21 and 26 revealed that T2677T and T3435T alleles are not a factor predisposing to lymphoproliferative diseases, but they determine the efficiency chemotherapy. Individuals with T2677T and T3435T haplotypes are at highest risk of drug resistance. Association between genotypes G2677T and C3435T was detected in normal subjects and in patients with lymphoproliferative diseases.
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